ㄙㄡsōuㄙㄨㄛˇsuǒㄎㄨㄔㄤˊcháng

  1. 比喻竭力思索紅樓夢·》:寶玉只得答應低頭搜索枯腸。」三俠五義·》:只見木匠兩旁各自搜索枯腸不願新奇討好?」文思泉湧

to rack one's brains (for apt wording etc)​ (idiom)​